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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
(2*x-4)/(x+6) = -2/15 // + -2/15
(2*x-4)/(x+6)-(-2/15) = 0
(2*x-4)/(x+6)+2/15 = 0
(15*(2*x-4))/(15*(x+6))+(2*(x+6))/(15*(x+6)) = 0
15*(2*x-4)+2*(x+6) = 0
32*x-48 = 0
(32*x-48)/(15*(x+6)) = 0
(32*x-48)/(15*(x+6)) = 0 // * 15*(x+6)
32*x-48 = 0
32*x-48 = 0 // + 48
32*x = 48 // : 32
x = 48/32
x = 3/2
x = 3/2
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